Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec0bd76448d73706…

MALICIOUS

PDF

88.9 KB Created: 2021-06-26 01:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 1fcfcfe2e7455a1a336be6b19472f0ea SHA-1: 279eff3aa2d886245edd48c7918a2a3c22876c33 SHA-256: ec0bd76448d73706c3e5b815ccde18f9a78ef9a8f155d1a30c16ee570244f3dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised WordPress sites hosting PDF files. This suggests a link farm or phishing lure designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf66de7daf---kabobuzegefel.pdf In PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afed52260a5---nawadubuz.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ub5bknn5hvfr2l9o7rdqut56j1/rezegugomaxifanudabotis.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/05588987bcdfd2005f9b78fcbe8593ff/kusanimozisepabudo.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/jolujaxuvamizavudepebu.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608727972ea32---webojidanifokifawewupimu.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/53142024169.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ee2a7d56d---borogitagozarebo.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608770c98b502---milonewalaxogolefo.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/tuxemesujugebuj.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3edf0bcb6---45336639733.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/dabogojosepexatetavipawu.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803eef6c158---98087652564.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/ba7e21716e8d69d8fa8f86db36ff36b3/69577185362.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098419ade27c---xisaz.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/6e9c67b270c77f0f82fd15e4e9cfca30/tewuxunatomanorofawevanu.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/5s32a6r3ms70p464o3iradm8b4/54846525117.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/kimulamevediv.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/84013762520.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/45131285069.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16080d73090386---xuzogimap.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160802b938be92---2664852515.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/06/file/202106260530583102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=alex+blanks+ready+to+love+updatePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49F 10888 bytes
SHA-256: ab5dadcc86ed9405d82a54b27ae5440e8bff4e30669b4c6cd45536ffd7697606
font_01_sfnt_off00010ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDB 17844 bytes
SHA-256: 76b893e201135bf8badef22717e1c887bb4df4fc25871a1bf93ee96af9cb0c00
font_02_sfnt_off00013cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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